System of motor control.



PATENTED DEC. 10, 1907'.

W. F. SCHNEIDER.

SYSTEM OF MOTOR CONTROL.

APPLIOATION FILED MAR. 25, 1907.

\mvewxov Sex/(ham UNITED STATES PATENT OFFICE.

WILLIAM F. SCHNEIDER, OF NORWOOD, OIII O, ASSIGNOR TO ALLIS-GHALMERS COMPANY, A CORPORATION OF NEW JERSEY, AND THE BULLOCK ELECTRIC MANUFACTURING COM- PANY, A CORPORATION OF OHIO.

Specification of Letters Patent.

Patented Dec. 10, 1907.

Application filed latch 25, 1907. Serial No. 364.293.

' To all whom it may concern:

Be it known that I, WILLIAM F. SCHNEI- DER, a citizen of the United States, resid' and exact specification.

My invention relates to controllers for electric motors.

It 15 sometimes desirable in motor controllers that an auxiliary switch be provided for so changing the relationship of the different meters or groups of motors that the same operation of themain controlling switch produces different results. This is especially useful for instance in railway controllers for cars which are operated both within city limits where high speeds are roliibited and beyiipd city limits where higli speeds are allowa e.

My present invention aims to rovide such a controller and to combine wit 1 the reversing switch the switch for varying the relationship of the'motors or groups of motors.

With these objects in view my invention broadly comprises the combination in a controller for electric motors, of a main control ling switch, and a combined reversing and series-parallel switch, the former being independent of the latter when the latter is in either series or parallel position.

More specifically my invention comprises the combination in a motor control system, of a plurality of groupsof motors, a main switch for varying the resistance in circuit with the motors and for changing the groups of motors from series to parallel and vice versa, and a separately operated switch for changi the individual motors in the grou from series to parallel and vice versa and fl: reversing the motors.

Other features of my invention will appear from the following description and drawings and will be particularly pointedput in the claims.

The sin le figure of the drawing'shows a diagram of connections of a system ofcontrol embodying my invention, the contact carrying drums being shown in development.

The electric motors A, B, C and D, having field windings a, b, c and d, are arranged in pairs or groups, A and B forming one group While C and D form another. A main seriesparallel controlling switch, consisting of a rotatable drum 15 provided with contacts 16 which cooperate with stationary contacts 17, has operative positions 1 to 12 inclusive. 1n the first seven of these positions the upper part of the main controlling switch connects the groups of motors in series while the lower part connects different amounts of the resistance 18 in circuit with the motors. In the last five of these positions the upper part of the main controlling switch connects the groups of motors in parallel while the lower partagain connects different amounts of the resistance 18 in circuit. This type of seriesparallel controlling switch is shown merely for the purpose of illustration, for my invention is not limited to any particular type of controller. In fact in some cases it is not necessary to use a series-parallel main switch at all, the drum 15 beingarranged merely for rheostatic control.

The drum 20 of the reversing switch cooperates with two rows of stationary contacts 21 and 22, these rows being arranged diametrically opposite. On the drum 20 are four rows of contacts, rows 23 and 24 cooperating with the row of stationary contacts 21, while rows 25 and 26 cooperate with the other row of stationary contacts 22. As indicated the rows of contacts 23 and 25 are in engagement with the rows of stationary contacts 21 and 22 respectively when forward movement of the meters is desired, while the rows of contacts 24 and 26 are in engagement withsaid rows of stationary contacts respectively when backward movement of the motors is desired- Each of the rows of movable contacts has two operative positions, P and S. hen the reversing switch is in a position S the individual motors of the groups are connected in series, while when it is in a osition P they are connected in parallel. en the reversing switch is in its Off position, the motor circuits are broken and can not be completed by the main drum 15; Any desired interlocking mechanism may be used between the drums 15 and 20.

7 By moving the main drum 15 when the reversing switch is in position Ahead S, the resistance 18 ma connected in series or in parallel series for forward movement. Save that the direction of currents in the field magnets 11, b, c and d is reversed, the connections with the reversbe varied and the motors 1 are usuall ing switch-in position Back S are the same as for position Ahead S. These two-positions are desirable for comparatively low speeds, such .as usually will be necessary for a car within the limits of a city.

By moving the main drum 15 whenthe revers'mg switch is in position Ahead P, the

resistance 18 may be varied and the motors connected in series parallel or in parallel. Save that the direction of current in the field windings a, b, c andd is reversed, the connections with the reversing switch in position Back P are the same as for position Ahead P". These two positions are desirable for com aratively high speeds, such as a lowable for interurban service. Thus the rum 15 controls the connections of the groups of moto'rs'in series or parallel" and the amount of the resistance 18 in circuit, while the drum 20 controls the direction of movement of the motors and the series or be desirable to have only one grou .of'motors and the main controlling-switc merely -'a rheostat, in which case the latter could be similar to the lower part of the drum 15 which is illustrated and the motors C and D and the rows of contacts22, 25 and 26 on the I reversing switch would be omitted, the lead from the lowest contact 21-being grounded.

Manymodific'ations maybe made in the I precise arrangements herein shown and deswitch, and another being operable when the plurality of series-parallel switches, one of, said switches being combined with a revers- 'ries-parallel an scribed, and all such which come within the spirit and sco e of 'my invention ,I aim to cover in the fo lowing claims.

, What I claim as new is 1. In a controller for electric motors, a re-' 'slstance-v'arym switch, and a combined re-' versin and series-parallel switch, the former being independent of the latter when the lat-" ter is in either series or parallel position.

2.In a controller for, electric motors, a main regulating switch, and a combined sereversin switch, the former being com letely operabfia for any operative position o the latter.

3; In a controller for electric motors, a pl rality of series-parallel switches, one of said switches being combined witha reversing first is in either series or parallelpositiori.

4. In a controller for electrlc motors, a

ing switch and another with a resistance-Va:

13mg switch, the latter being operableffor in series or in paralle and asecond rotatable drum for reversin the motors and for con- 1 operative positions of theformer. 5. In a controllerfor electric motors, a

switch for varying the relationship of the motors to be controlled'in one manner, and

a second switch for varying the relationship -sitionsfo'r all operative ositionso 9. In a controller or electric'motors, a;

"m n the latter occupies.

. 12. A system of motor control, comprising of the motors to be controlled in another manner and'for reversing the motors.

-6. In a controllenfor electric motors, a switch for varying the relationship of the motors to be" controlled in one manner and for varying the resistance in the motor circuits, and a. second switch for varying the relationship of. the motors in another manner and for reversing the motors. ,J

7."In a controller for electric motors, a combined series-parallel and resistance-varying switch,"and a separate combined seriesarallel and reversing switch, the former be-, mg movable to both series and arallel positions when the latter is in eit er series or parallel position.

. 8. In a controllerfor electric motors, the combination of a rotatable series-parallel and resistance-varying drum, and a rotatable sebeing movable in both series and palpalllel pot e atter.

rotatable resistance-varying drum, and a separate rotatable seriesarallel and reversing drum, the former bemg completely operable whether the latter is in series or parallel position. v

10. In a controller for electric; motors, a plurality of rotatable series-parallel drums, one of said drums being combined with areversing switch, and another being operable whether the first is in aseries or a par-allel position;

' 1 1. In a system of motor control, a plurality of motors to be controlled, a switch for var ing the resistance in the motor circuits,

an a separate switch for reversing the mo:

tors and for connecting parallel, the former switch being. 'ompletely o erable regardless of what operative posta plurality of groups of motors, a switch for connecting the groups of motors in difierent relations, and a se arate switch for connectthem in series or in the individua motors in each group in 1n dizerent relations and for reversing the mo-' tors.

13. A system of motor control, comprising varying t e resistance in circuit with said motors and for connecting the different groups of motors in various relations, and a separate switch for reversing thev motors and a pluralit of groups of motors, a switch for for connecting the individual motors ineach group in different relations.

1.4.' A motor control system, comprisin a plurality of groups of motors, a rotata 1e rum for connectm said groups of motors a plurality of grou s of motors, a rotatable drum for varying t 1e resistance of the motor circuits and for connecting the groups of motors in series or in parallel, and a separate rotatable drum for reversing the motors and for connecting the motors of the individual groups in series or in parallel.

16. A motor control system, comprising a plurality of motors, a main switch for controlling the speeds of said motors, and a sepa-' rately o )erated switch for reversing said motors and for connecting them in different r6,- lations, the former switch being independent of the latter when the latter is in any operative position.

17. In a motor control s 'stem, a plurality of motors, a main controlling switch, a reversing switch having two sets of positions, and connections so arranged that with the reversing switch in any one of one set of po sitions the controlling switch ma connect the motors in either series or para lel series, and with the reversing switch in any one of another set of positions the controlling,

switch may connect the motors in either series parallel or parallel.

18. In a motor control 3 stem, a plurality of motors, a main controlling switch, a re versing switch having two sets of positions,

and connections so arranged that with the reversing switch in any one of one set of positions the controlling switch may connect the motors in either series or parallel series, and with the reversing switch in any one of the other set of positions the controlling switch ma connect the motors in either so ries aral el or parallel, said controlling switci being also arranged to vary the resistance in circuit with the motors.

19. In combination, a plurality of motors, a resistance, a combined series-parallel and reversing switch for said motors, and means for connecting said resistance in series with all of said motors whether the latter are connected in series or parallel.

20. In combination, a plurality of motors, a resistance, a combinedseries-parallel and reversing switch for said motors, and means for connecting said resistance in series with all of said motors whether the latter are connected in series or parallel and for varying the amount of said resistance in circuit.

In testimony whereof I 'aflix my signature, in the presence of two witnesses.

WILLL XM F. SCHNEIDER. Witnesses:

GEO. B. SonLEY, FRED J. KINSEY. 

